//rollover and image preload functions
var arrPreload;
function preloadImages() {
    var a = new Array();
    newImage(a[a.length],'/images/nav_intro-over.gif');
    newImage(a[a.length],'/images/nav_integration-over.gif');
    newImage(a[a.length],'/images/nav_lessons-over.gif');
    newImage(a[a.length],'/images/nav_strategies-over.gif');
    newImage(a[a.length],'/images/nav_workshops-over.gif');
    newImage(a[a.length],'/images/nav_contribute-over.gif');
    newImage(a[a.length],'/images/nav_resources-over.gif');
    newImage(a[a.length],'/images/blurb-nav_intro_over.gif');
    newImage(a[a.length],'/images/blurb-nav_integration_over.gif');
    newImage(a[a.length],'/images/blurb-nav_lessons_over.gif');
    newImage(a[a.length],'/images/blurb-nav_strategies_over.gif');
    newImage(a[a.length],'/images/blurb-nav_workshops_over.gif');
    newImage(a[a.length],'/images/blurb-nav_contribute_over.gif');
    newImage(a[a.length],'/images/blurb-nav_resources_over.gif');

    arrPreload = a;
}

function newImage(i, src) {
    i = new Image();
    i.src = src;
    return i;
}

function swapImg() {
	if (document.images && typeof(arrPreload) == 'object') {
        var args = swapImg.arguments;
        for (var i=0; i < args.length; i+=2) {
			document[args[i]].src = args[i+1];
		}
	}
}